BBC Four HD Saturday

Kate Humble, Patrick Ayree and experts follow the changing seasons at Yellowstone National Park during 2016, starting with the effect of winter on its wildlife

Old-time music hall entertainment from 1976, featuring Ronnie Corbett, Kenneth McKellar, Rosemary Squires, the Looneys and members of the Players Theatre, London

Hetty is embroiled in a case involving a deaf birdwatcher whose disappearance coincides with the discovery of a woman's body at the bottom of a cliff

The writer and director looks back on one of his most popular and influential TV plays, which helped put him on the map, along with stars Alison Steadman and Roger Sloman

A couple head to Dorset for a camping holiday, but their idyll is shattered by the arrival of noisy neighbours. Mike Leigh's comedy, starring Roger Sloman and Alison Steadman

A 1982 profile in which the dramatist talks about his career and demonstrates the unique processes of character-building and improvisation in his work

The actress reminisces about her career, including her successes with director and ex-husband Mike Leigh, with whom she created the monstrous Beverly in 1970s play Abigail's Party

MI5 reveals its former head was a double agent who worked as a Russian spy. Making it worse, he'd investigated and given security clearance by Sir Humphrey

Jim tries to improve employment figures by moving military units around the country. Satirical comedy, starring Paul Eddington

Hetty is embroiled in a case involving a deaf birdwatcher whose disappearance coincides with the discovery of a woman's body at the bottom of a cliff